Synthesis of Mg-doped LiMn₂O₄ powders for lithium-ion batteries by rotary heating

In order to improve the mixing uniformity and also to ensure the homogeneity of the particle size of the prepared Mg-doped LiMn₂O ₄ compounds, rotary heating was used as a synthesis technique. The starting materials, Li₂CO₃, MgO and MnO₂, were mixed uniformly using a traditional ball milling, which resulted in a uniform particle size distribution in the mixed powders. LiMg_0.1Mn _1.9O₄ powders were synthesized at 700-900°C using a rotary furnace. The LiMg_0.1Mn_1.9O₄ powder with a narrow particle size distribution synthesized at 800°C for 15h presents the best electrochemical performance, which delivers an initial discharge capacity of 119mAhg^-1 and exhibits a good cycle stability. The method of rotary heating should be an attractive technique for the industrial production of doped spinels.